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Theorem sltssn 28186
Description: Surreal set less-than of two singletons. (Contributed by Scott Fenton, 17-Mar-2025.)
Hypotheses
Ref Expression
sltssn.1 (𝜑 → 𝐴 ∈ No)
sltssn.2 (𝜑 → 𝐵 ∈ No)
sltssn.3 (𝜑 → 𝐴 <s 𝐵)
Assertion
Ref Expression
sltssn (𝜑 → {𝐴} <<s {𝐵})

Proof of Theorem sltssn
StepHypRef Expression
1 sltssn.3 . 2 (𝜑 → 𝐴 <s 𝐵)
2 sltssn.1 . . 3 (𝜑 → 𝐴 ∈ No)
3 sltssn.2 . . 3 (𝜑 → 𝐵 ∈ No)
42, 3sltssnb 28185 . 2 (𝜑 → ({𝐴} <<s {𝐵} ↔ 𝐴 <s 𝐵))
51, 4mpbird 260 1 (𝜑 → {𝐴} <<s {𝐵})
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ∈ wcel 2147  {csn 4588   class class class wbr 5106  Nocsur 28027   <s clts 28028   <<s cslts 28173
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-ext 2735  ax-sep 5252  ax-pr 5395
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2102  df-clab 2742  df-cleq 2755  df-clel 2839  df-ral 3081  df-rex 3091  df-rab 3417  df-v 3456  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-sn 4589  df-pr 4591  df-op 4839  df-br 5107  df-opab 5171  df-xp 5661  df-slts 28174
This theorem is used by:  cutneg  28232  zcuts  28823  twocut  28839  nohalf  28840  pw2recs  28854  halfcut  28874  addhalfcut  28875  pw2cut2  28878  bdaypw2n0bndlem  28879  bdayfinbndlem1  28883
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